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| <a href="watcher_8hpp.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">// Licensed to the Apache Software Foundation (ASF) under one</span></div> |
| <div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">// or more contributor license agreements. See the NOTICE file</span></div> |
| <div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">// distributed with this work for additional information</span></div> |
| <div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">// regarding copyright ownership. The ASF licenses this file</span></div> |
| <div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment">// to you under the Apache License, Version 2.0 (the</span></div> |
| <div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment">// "License"); you may not use this file except in compliance</span></div> |
| <div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment">// with the License. You may obtain a copy of the License at</span></div> |
| <div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment">//</span></div> |
| <div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment">// http://www.apache.org/licenses/LICENSE-2.0</span></div> |
| <div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment">//</span></div> |
| <div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment">// Unless required by applicable law or agreed to in writing, software</span></div> |
| <div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment">// distributed under the License is distributed on an "AS IS" BASIS,</span></div> |
| <div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment">// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span></div> |
| <div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment">// See the License for the specific language governing permissions and</span></div> |
| <div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment">// limitations under the License</span></div> |
| <div class="line"><a name="l00016"></a><span class="lineno"> 16</span> </div> |
| <div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="preprocessor">#ifndef __MESOS_ZOOKEEPER_WATCHER_HPP__</span></div> |
| <div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="preprocessor"></span><span class="preprocessor">#define __MESOS_ZOOKEEPER_WATCHER_HPP__</span></div> |
| <div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="preprocessor"></span></div> |
| <div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="preprocessor">#include <stdint.h></span></div> |
| <div class="line"><a name="l00021"></a><span class="lineno"> 21</span> </div> |
| <div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="preprocessor">#include <glog/logging.h></span></div> |
| <div class="line"><a name="l00023"></a><span class="lineno"> 23</span> </div> |
| <div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="preprocessor">#include <<a class="code" href="include_2mesos_2zookeeper_2zookeeper_8hpp.html">mesos/zookeeper/zookeeper.hpp</a>></span></div> |
| <div class="line"><a name="l00025"></a><span class="lineno"> 25</span> </div> |
| <div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="preprocessor">#include <<a class="code" href="dispatch_8hpp.html">process/dispatch.hpp</a>></span></div> |
| <div class="line"><a name="l00027"></a><span class="lineno"> 27</span> </div> |
| <div class="line"><a name="l00028"></a><span class="lineno"> 28</span> </div> |
| <div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment">// A watcher which dispatches events to a process. Note that it is</span></div> |
| <div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment">// only "safe" to reuse an instance across ZooKeeper instances after a</span></div> |
| <div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment">// session expiration. TODO(benh): Add a 'reset/initialize' to the</span></div> |
| <div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment">// Watcher so that a single instance can be reused.</span></div> |
| <div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="comment">// NOTE: By the time the dispatched events are processed by 'pid',</span></div> |
| <div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment">// its session ID may have changed! Therefore, we pass the session ID</span></div> |
| <div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment">// for the event to allow the 'pid' Process to check for staleness.</span></div> |
| <div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="keyword">template</span> <<span class="keyword">typename</span> T></div> |
| <div class="line"><a name="l00037"></a><span class="lineno"><a class="line" href="classProcessWatcher.html"> 37</a></span> <span class="keyword">class </span><a class="code" href="classProcessWatcher.html">ProcessWatcher</a> : <span class="keyword">public</span> <a class="code" href="classWatcher.html">Watcher</a></div> |
| <div class="line"><a name="l00038"></a><span class="lineno"> 38</span> {</div> |
| <div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="keyword">public</span>:</div> |
| <div class="line"><a name="l00040"></a><span class="lineno"><a class="line" href="classProcessWatcher.html#ae6f5acc4af4d936adca882e2274e6491"> 40</a></span>  <span class="keyword">explicit</span> <a class="code" href="classProcessWatcher.html#ae6f5acc4af4d936adca882e2274e6491">ProcessWatcher</a>(<span class="keyword">const</span> <a class="code" href="structprocess_1_1PID.html">process::PID<T></a>& _pid)</div> |
| <div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  : pid(_pid), reconnect(false) {}</div> |
| <div class="line"><a name="l00042"></a><span class="lineno"> 42</span> </div> |
| <div class="line"><a name="l00043"></a><span class="lineno"><a class="line" href="classProcessWatcher.html#a8858c74f313c22f72836beabb73e7c27"> 43</a></span>  <span class="keyword">virtual</span> <span class="keywordtype">void</span> <a class="code" href="classProcessWatcher.html#a8858c74f313c22f72836beabb73e7c27">process</a>(</div> |
| <div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  <span class="keywordtype">int</span> type,</div> |
| <div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  <span class="keywordtype">int</span> state,</div> |
| <div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  int64_t sessionId,</div> |
| <div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <span class="keyword">const</span> std::string& path)</div> |
| <div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  {</div> |
| <div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <span class="keywordflow">if</span> (type == ZOO_SESSION_EVENT) {</div> |
| <div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  <span class="keywordflow">if</span> (state == ZOO_CONNECTED_STATE) {</div> |
| <div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="comment">// Connected (initial or reconnect).</span></div> |
| <div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  <a class="code" href="namespaceprocess.html#acfbc29404bc653268289691b0dd59e22">process::dispatch</a>(pid, &T::connected, sessionId, reconnect);</div> |
| <div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="comment">// If this watcher gets reused then the next connected</span></div> |
| <div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <span class="comment">// event shouldn't be perceived as a reconnect.</span></div> |
| <div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  reconnect = <span class="keyword">false</span>;</div> |
| <div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (state == ZOO_CONNECTING_STATE) {</div> |
| <div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <span class="comment">// The client library automatically reconnects, taking</span></div> |
| <div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="comment">// into account failed servers in the connection string,</span></div> |
| <div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <span class="comment">// appropriately handling the "herd effect", etc.</span></div> |
| <div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <a class="code" href="namespaceprocess.html#acfbc29404bc653268289691b0dd59e22">process::dispatch</a>(pid, &T::reconnecting, sessionId);</div> |
| <div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <span class="comment">// TODO(benh): If this watcher gets reused then the next</span></div> |
| <div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  <span class="comment">// connected event will be perceived as a reconnect, but it</span></div> |
| <div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="comment">// should not.</span></div> |
| <div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  reconnect = <span class="keyword">true</span>;</div> |
| <div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (state == ZOO_EXPIRED_SESSION_STATE) {</div> |
| <div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  <a class="code" href="namespaceprocess.html#acfbc29404bc653268289691b0dd59e22">process::dispatch</a>(pid, &<a class="code" href="namespaceprocess_1_1internal.html#a8847bb6267d177c5e587f482b823b908">T::expired</a>, sessionId);</div> |
| <div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="comment">// If this watcher gets reused then the next connected</span></div> |
| <div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="comment">// event shouldn't be perceived as a reconnect.</span></div> |
| <div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  reconnect = <span class="keyword">false</span>;</div> |
| <div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  } <span class="keywordflow">else</span> {</div> |
| <div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  LOG(FATAL) << <span class="stringliteral">"Unhandled ZooKeeper state ("</span> << state << <span class="stringliteral">")"</span></div> |
| <div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  << <span class="stringliteral">" for ZOO_SESSION_EVENT"</span>;</div> |
| <div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  }</div> |
| <div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (type == ZOO_CHILD_EVENT) {</div> |
| <div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <a class="code" href="namespaceprocess.html#acfbc29404bc653268289691b0dd59e22">process::dispatch</a>(pid, &T::updated, sessionId, path);</div> |
| <div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (type == ZOO_CHANGED_EVENT) {</div> |
| <div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  <a class="code" href="namespaceprocess.html#acfbc29404bc653268289691b0dd59e22">process::dispatch</a>(pid, &T::updated, sessionId, path);</div> |
| <div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (type == ZOO_CREATED_EVENT) {</div> |
| <div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  <a class="code" href="namespaceprocess.html#acfbc29404bc653268289691b0dd59e22">process::dispatch</a>(pid, &T::created, sessionId, path);</div> |
| <div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (type == ZOO_DELETED_EVENT) {</div> |
| <div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <a class="code" href="namespaceprocess.html#acfbc29404bc653268289691b0dd59e22">process::dispatch</a>(pid, &T::deleted, sessionId, path);</div> |
| <div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  } <span class="keywordflow">else</span> {</div> |
| <div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  LOG(FATAL) << <span class="stringliteral">"Unhandled ZooKeeper event ("</span> << type << <span class="stringliteral">")"</span></div> |
| <div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  << <span class="stringliteral">" in state ("</span> << state << <span class="stringliteral">")"</span>;</div> |
| <div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  }</div> |
| <div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  }</div> |
| <div class="line"><a name="l00087"></a><span class="lineno"> 87</span> </div> |
| <div class="line"><a name="l00088"></a><span class="lineno"> 88</span> <span class="keyword">private</span>:</div> |
| <div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="keyword">const</span> <a class="code" href="structprocess_1_1PID.html">process::PID<T></a> pid;</div> |
| <div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="keywordtype">bool</span> reconnect;</div> |
| <div class="line"><a name="l00091"></a><span class="lineno"> 91</span> };</div> |
| <div class="line"><a name="l00092"></a><span class="lineno"> 92</span> </div> |
| <div class="line"><a name="l00093"></a><span class="lineno"> 93</span> <span class="preprocessor">#endif // __MESOS_ZOOKEEPER_WATCHER_HPP__</span></div> |
| <div class="ttc" id="dispatch_8hpp_html"><div class="ttname"><a href="dispatch_8hpp.html">dispatch.hpp</a></div></div> |
| <div class="ttc" id="classProcessWatcher_html_a8858c74f313c22f72836beabb73e7c27"><div class="ttname"><a href="classProcessWatcher.html#a8858c74f313c22f72836beabb73e7c27">ProcessWatcher::process</a></div><div class="ttdeci">virtual void process(int type, int state, int64_t sessionId, const std::string &path)</div><div class="ttdef"><b>Definition:</b> watcher.hpp:43</div></div> |
| <div class="ttc" id="namespaceprocess_html_acfbc29404bc653268289691b0dd59e22"><div class="ttname"><a href="namespaceprocess.html#acfbc29404bc653268289691b0dd59e22">process::dispatch</a></div><div class="ttdeci">void dispatch(const PID< T > &pid, void(T::*method)())</div><div class="ttdef"><b>Definition:</b> dispatch.hpp:157</div></div> |
| <div class="ttc" id="classWatcher_html"><div class="ttname"><a href="classWatcher.html">Watcher</a></div><div class="ttdoc">This interface specifies the public interface an event handler class must implement. </div><div class="ttdef"><b>Definition:</b> zookeeper.hpp:52</div></div> |
| <div class="ttc" id="classProcessWatcher_html_ae6f5acc4af4d936adca882e2274e6491"><div class="ttname"><a href="classProcessWatcher.html#ae6f5acc4af4d936adca882e2274e6491">ProcessWatcher::ProcessWatcher</a></div><div class="ttdeci">ProcessWatcher(const process::PID< T > &_pid)</div><div class="ttdef"><b>Definition:</b> watcher.hpp:40</div></div> |
| <div class="ttc" id="namespaceprocess_1_1internal_html_a8847bb6267d177c5e587f482b823b908"><div class="ttname"><a href="namespaceprocess_1_1internal.html#a8847bb6267d177c5e587f482b823b908">process::internal::expired</a></div><div class="ttdeci">void expired(const lambda::function< Future< T >(const Future< T > &)> &f, const std::shared_ptr< Latch > &latch, const std::shared_ptr< Promise< T >> &promise, const Future< T > &future)</div><div class="ttdef"><b>Definition:</b> future.hpp:1333</div></div> |
| <div class="ttc" id="structprocess_1_1PID_html"><div class="ttname"><a href="structprocess_1_1PID.html">process::PID</a></div><div class="ttdoc">A &quot;process identifier&quot; used to uniquely identify a process when dispatching messages. </div><div class="ttdef"><b>Definition:</b> pid.hpp:127</div></div> |
| <div class="ttc" id="include_2mesos_2zookeeper_2zookeeper_8hpp_html"><div class="ttname"><a href="include_2mesos_2zookeeper_2zookeeper_8hpp.html">zookeeper.hpp</a></div></div> |
| <div class="ttc" id="classProcessWatcher_html"><div class="ttname"><a href="classProcessWatcher.html">ProcessWatcher</a></div><div class="ttdef"><b>Definition:</b> watcher.hpp:37</div></div> |
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